AlphaHybrids
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- Nov 29, 2009
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It's hard to say if it was a forward seal failure off the bat.
To me it looks like you got a hot spot because of a liner deficiency, that let the case yield at high pressure - evidenced by the tearing of the aluminum case - and then you blow torched everything after it released.
This also let the motor operate for a couple of seconds before the failure started.
Cases I've seen that start out as a seal failure generally don't tear aluminum like that, they melt large holes through the casing. Just last year I saw it on a 4-inch hybrid where a pressure tap wasn't properly sealed. Motor fired, nominal for a couple seconds, then you could see hot gas then it was flames coming out of the motor. No tearing of the case like seen in your pictures.
I'd put a six pack of beer down on liner failure, followed by case failure.
Edward
To me it looks like you got a hot spot because of a liner deficiency, that let the case yield at high pressure - evidenced by the tearing of the aluminum case - and then you blow torched everything after it released.
This also let the motor operate for a couple of seconds before the failure started.
Cases I've seen that start out as a seal failure generally don't tear aluminum like that, they melt large holes through the casing. Just last year I saw it on a 4-inch hybrid where a pressure tap wasn't properly sealed. Motor fired, nominal for a couple seconds, then you could see hot gas then it was flames coming out of the motor. No tearing of the case like seen in your pictures.
I'd put a six pack of beer down on liner failure, followed by case failure.
Edward